/*
 * jPOS Project [http://jpos.org]
 * Copyright (C) 2000-2015 Alejandro P. Revilla
 *
 * This program is free software: you can redistribute it and/or modify
 * it under the terms of the GNU Affero General Public License as
 * published by the Free Software Foundation, either version 3 of the
 * License, or (at your option) any later version.
 *
 * This program is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 * GNU Affero General Public License for more details.
 *
 * You should have received a copy of the GNU Affero General Public License
 * along with this program.  If not, see <http://www.gnu.org/licenses/>.
 */

package org.jpos.iso.channel;

import org.jpos.iso.*;
import org.jpos.util.LogEvent;
import org.jpos.util.Logger;

import java.io.IOException;
import java.net.ServerSocket;

/**
 * Implements an ISOChannel able to exchange messages with
 * ACI's BASE24 over a TCP link, modified from BASE24ISOChannel
 * by Victor A. Salaman (salaman@teknos.com) .<br>
 * An instance of this class exchanges messages by means of an
 * intermediate 'port server' as described in the
 * <a href="/doc/javadoc/overview-summary.html">Overview</a> page.
 *
 * @author apr@cs.com.uy
 * @author salaman@teknos.com
 * @version $Id$
 * @see ISOMsg
 * @see ISOException
 * @see ISOChannel
 */

@SuppressWarnings("deprecation")
public class BASE24TCPChannel extends BaseChannel {
	/**
	 * Public constructor (used by Class.forName("...").newInstance())
	 */
	public BASE24TCPChannel() {
		super();
	}

	/**
	 * Construct client ISOChannel
	 *
	 * @param host server TCP Address
	 * @param port server port number
	 * @param p    an ISOPackager
	 * @see ISOPackager
	 */
	public BASE24TCPChannel(String host, int port, ISOPackager p) {
		super(host, port, p);
	}

	/**
	 * Construct server ISOChannel
	 *
	 * @param p an ISOPackager
	 * @throws IOException
	 * @see ISOPackager
	 */
	public BASE24TCPChannel(ISOPackager p) throws IOException {
		super(p);
	}

	/**
	 * constructs a server ISOChannel associated with a Server Socket
	 *
	 * @param p            an ISOPackager
	 * @param serverSocket where to accept a connection
	 * @throws IOException
	 * @see ISOPackager
	 */
	public BASE24TCPChannel(ISOPackager p, ServerSocket serverSocket)
			throws IOException {
		super(p, serverSocket);
	}

	/**
	 * @param m   the Message to send (in this case it is unused)
	 * @param len message len (ignored)
	 * @throws IOException
	 */
	protected void sendMessageTrailler(ISOMsg m, int len) throws IOException {
		serverOut.write(3);
	}

	protected void sendMessageLength(int len) throws IOException {
		len++;  // one byte trailler
		serverOut.write(len >> 8);
		serverOut.write(len);
	}

	protected int getMessageLength() throws IOException, ISOException {
		int l = 0;
		byte[] b = new byte[2];
		Logger.log(new LogEvent(this, "get-message-length"));
		while (l == 0) {
			serverIn.readFully(b, 0, 2);
			l = ((int) b[0] & 0xFF) << 8 | (int) b[1] & 0xFF;
			if (l == 0) {
				serverOut.write(b);
				serverOut.flush();
			}
		}
		Logger.log(new LogEvent(this, "got-message-length", Integer.toString(l)));
		return l - 1;   // trailler length
	}

	protected void getMessageTrailler() throws IOException {
		Logger.log(new LogEvent(this, "get-message-trailler"));
		byte[] b = new byte[1];
		serverIn.readFully(b, 0, 1);
		Logger.log(new LogEvent(this, "got-message-trailler", ISOUtil.hexString(b)));
	}
}

